Merge vvagin@bk-internal.mysql.com:/home/bk/mysql-4.0

into eagle.mysql.r18.ru:/home/vva/work/BUG_2023/mysql-4.0

mysql-test/r/type_enum.result

@@ -1636,3 +1636,13 @@ t1	CREATE TABLE `t1` (
   `a` enum('','a','b') NOT NULL default 'b'
 ) TYPE=MyISAM
 drop table t1;
+create table t1 (a enum ('0','1'));
+insert into t1 set a='foobar';
+select * from t1;
+a
+
+update t1 set a = replace(a,'x','y');
+select * from t1;
+a
+
+drop table t1;

mysql-test/t/type_enum.test

@@ -21,3 +21,14 @@ drop table t1;
 create table t1 (a enum (' ','a','b ') not null default 'b ');
 show create table t1;
 drop table t1;
+
+#
+# Tests of wrong enum values (bug #2023)
+#
+
+create table t1 (a enum ('0','1'));
+insert into t1 set a='foobar';
+select * from t1;
+update t1 set a = replace(a,'x','y');
+select * from t1;
+drop table t1;
\ No newline at end of file

sql/field.cc

@@ -4721,7 +4721,7 @@ String *Field_enum::val_str(String *val_buffer __attribute__((unused)),
 {
   uint tmp=(uint) Field_enum::val_int();
   if (!tmp || tmp > typelib->count)
-    val_ptr->length(0);
+    val_ptr->set((char*)"",0);
   else
     val_ptr->set((const char*) typelib->type_names[tmp-1],
 		 (uint) strlen(typelib->type_names[tmp-1]));